Shell for rock-drilling machines



R P SAFFOLD SHELL FOR ROCK DRILLING MACHINES.

APPLICATION FILED MAR. 25.1920.-

Patented Apr. 11, 19221.-

P011 P Snf IN V EN TOR.

- ATTORNEY'J RAY P. SAFFODD,

BI SBEE, ARIZONA.

SHELL FOE ROCK-DRILLING MACHINES.

Specification of Letters Patent. Pat gnf d A 11 19522 Application filedMarch 25, 1920. Serial No. 368,541.

To all 10/tomit mag/ concern:

Be it known that T, Bar P. SArroLn, of Bisbee, in the county of Cochiseand State of Arizona, have invented certain new and use ful Improvementsin Shells for Rock-Drilt ing Machines; and I do'hereby declare thefollowing to be a full, clear, and exact description of the invention.such as will enable others skilled in the art to which it appertains tomake and use the same.

This invention relates to shells for rock drills. The object is toprovide a shell whichis so formed that it may be turned for the purposeof changing a drill without necessity of first applying a wrench orother tool for loosening the clamp which connects the shell with thesupporting arm of the frame, simple and efficient means being providedfor rigidly connecting the shell with the su-pport ing frame in normalposition of the drilling machine and which means is effective for quickmanipulation to allow the shell to be turned to change the drill, theimprovements in the construction of the shell being such as to avoidloss of time in the present common practice of first loosening the.clamping means to turn the shell and also in finding the originalposition of the machine with regard to the line of the hole.

Referring to the drawings, Figure 1 is a longitudinal sectional view ofa shell equipped with my improvements. Figure 2 is a perspective view ofone end-of the locking rod. Figure 3 is a perspective view of the outershell.

The shell is indicated at A and is equipped with the usual feed screw Bsupported at one end of the shell by a hanger C.

The shell has a vertical opening 1 which, in the form illustratedherein, is screw threaded to receive the upper cylindrical screwthreaded end of what I term an inner cone 2, this cone forming aconnection between the shell and a base to be later described. It ismanifest that this cone may be secured to the shell in other ways The Icylindrical portion of the inner cone is transversely bored, as at 3,and this bore is adapted to aline with recesses 4, 5 of the shell.

An outer cone 10 is fitted over the inner cone 2, and constitutes thebase 9f the shell. The cones are adapted for relative rotary movement,the outer cone being, in its coupled relation with the shell, the meansto which a clamp is secured to fasten the shell to the frame of themachine. The top of the enter cone has recesses 12. 13, corresponding'to the recesses 4- and 5 of the shell. At 1-l I mm e shown a screwthreaded washer tor holding the inner and outer cones in position.

It is necessary in the normal operation of the drillmgmachine that theinner and outer cones and the shell proper be securely locked so thatthere can be no movement of anv of these parts relative to another. Thislocliing is'eifected by means of a rod 19 disposed loiigitud'ina'lly ofthe shell with its outer end supported in a bracket 20 formed on theshell. This rod has a cylindrical portion 21 and two semi-cylindricalportions 22 and 23, the cylindrical portion lying wholly within the boreof the inner cone, and the portions 22 and 23 taking in the recesses 4,12, and 5', 13, respectively, of the shell and the outer cone. VVhenthesemi-cylindrical portions and 23 of the rod are turned so that thevoccupy the recesses, 12 and 13 of the outer cone, the shell, the innercone and the outer Gone are locked as against any relative movement. 011the other hand, with the rod turned so that the semi-cylindricalportions 22 and 23 are within the recesses 4E and 5 of the shell, thelatter with the inner cone max be turned relatively to the outer conewhich is held fast to the supporting arm, the flat faces of thesemi-cylindrical portions 22 and 23 riding over the top of the outercone. The rod 19 is equipped at its outer end with a. handle by which itmay be turned, appropriate means, such as a stop 24. being arranged forlimiting and indicating the turning movement of the rod.

In the use of my improved shell, it will be manifest that the shell maybe secured to the supporting arm by any preferred clamping means, suchclamp gripping the outer cone or base 10 in a manner well known in theart. With the locking rod 19 turned so that 7 the art.

While I have shown and described a shell including a base which has inpart the configuration of known shell. bases, it is manifest that inlieu of'the outer cone to which the ordinary clamp is secured this partof the shell base might be made integral with the clamp or other partsupporting the shellon.

the two parts being effective to rigidly secure the shell to thesupporting frame and yet capable of such manipulationas to permitrelative movement between the shell and the inner cone or member on theone hand and the outer cone on the other.

I claim as my invention:

1. A shell for rock drilling machines in.- cluding a base comprising acone-like member fixedly secured to said shell and having a transversebore and a second cone-like member fitted over said first mentionedmember and which members are adapted for relative movement, a rodextending through the transverse bore of said first cone-like member andadapted in one position to lock said members against movement and in are verse position to permit relative movement.

2. A. shell for rock'drilling machines including a base comprising acone-like member fixedly secured to said shell and having a transversebore and a second member fitted over said first mentioned member andwhich members are adapted for relative movement, said second memberhaving recesses adapted to aline with the transverse bore of saidcone-like member, a rod extending into said recesses and bore forlocking said memv bers against relative movement,. said rod havingcut-away portions permitting it to be turned out ofengagement wlth there cesses of. said second member to allow .rela.

tive movement of said members. 7

A shell for rock drilling machines in cluding a base comprising an outermember having a flat, face adapted to register with a similar face onsaid shell the face of the outer member and the face of the shell havingcomplementary recesses, an inner member connecting said outer memberwith between the members, and a handlejfor' turning saidrod. V

In testimony whereof I have s gned this specification; 1 J

' RAY P. .SAFFOLD.

